In the 2018 midterms, my congressional district in southern Orange County elected a Democrat named Katie Porter. Although she is quite progressive, she strongly opposes the new cap on deductions state and local taxes (SALT). Southern Orange County is mostly upper middle class, and this tax change hits our area harder than many other parts of the US. Nonetheless, the cap on SALT deductions is a progressive provision in the tax code, with the higher tax burden falling overwhelmingly on...